export default {
  mounted(el, binding) {
    binding.instance.$nextTick(() => {
      const dragDom = binding.value.$el.querySelector('.el-dialog')
      el.onmousedown = (e) => {
        // 鼠标按下，计算当前元素距离可视区的距离
        const disX = e.clientX - el.offsetLeft

        document.onmousemove = function (e) {
          e.preventDefault() // 移动时禁用默认事件

          // 通过事件委托，计算移动的距离
          const l = e.clientX - disX
          dragDom.style.width = `${l}px`
        }

        document.onmouseup = function () {
          document.onmousemove = null
          document.onmouseup = null
        }
      }
    })
  }
}
